Bug 17196: Update switch_marc21_series_info.pl

Bug 17196: Update switch_marc21_series_info.pl

Not sure if this script is still used, could someone confirm?

Test plan:
If you know how to test it, please do

Signed-off-by: Mason James <mtj@kohaaloha.com>
Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Zeno Tajoli <z.tajoli@cineca.it>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>